Takara Tomy has demonstrated a portable karaoke system built into a 7cm cube.

The Hi-kara is a complete karaoke machine and includes a 2.4in LCD screen on which video and song lyrics are displayed. Users can hear the music and sing through a custom headset that includes a microphone, or it can be hooked-up to a pair of speakers so that multiple people can hear the song.

White and pink models of the Hi-kara, which is aimed at children of around eight-years-old, will go on sale in Japan on 18 October and will cost ¥10,500 (£50).

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Songs can be added to the system in cartridges that will cost either ¥2,100 for 10 songs or ¥3,675 for 20 songs. Takara Tomy plans to offer both preloaded cartridges and pre-paid blank ones on to which users can download songs of their choice through a planned internet site.

Four AA-batteries will provide enough power for about four-and-a-half hours use. Takara Tomy hopes to sell 500,000 units of the Hi-kara during its first year on sale.